the sell is that you can save time

How do you know when salespeople (and lawyers) are lying? It’s only when their lips are moving.

developers are being demanded to become fractional CTOs by using LLM because they are being measured by expected productivity increases that limit time for understanding.

That’s the kind of thing that works out in the end. Like outsourcing to Asia, etc. It does work for some cases, it can bring sustainable improvements to the bottom line, but nowhere near as fast or easy or cheaply as the people selling it say.